IBAN Validator

An IBAN (International Bank Account Number) is an internationally agreed system for identifying bank accounts across national borders. It consists of a country code, check digits, and a bank account number.

IBAN validation uses the MOD-97 algorithm. The country code and check digits are moved to the end, letters are converted to numbers, and the result is divided by 97. A remainder of 1 confirms the IBAN is valid.

An IBAN contains the country code (first 2 letters), check digits (next 2 numbers), and the Basic Bank Account Number (BBAN) which includes the bank code and account number specific to each country.

Yes! All processing happens entirely in your browser. Your IBAN is never sent to any server. No data is collected, stored, or transmitted.

Over 80 countries use IBAN, including all European Union member states, the UK, Switzerland, and many Middle Eastern and Caribbean nations. The US and Canada use different systems.